def show():
    print('hello ')
    print(' world')
    print('python')

show()

def show2():
    for i in range(100+1):
        if is_prime( i):
            print(i,end=' ')


def is_prime(n):
    for i in range(2,n):
        if n % i == 0:
            return False
    return True
show2()

def show3(a,b):
    return a+b,a-b,a*b,a/b
print(show3(10,20))

def fib(n):
    if n <= 2:
        return 1
    return fib(n-1)+fib(n-2)

for i in range(1,20+1):
    print(fib(i))
def fib2(n):
    a,b = 1,1
    for i in range(3,n+1):
        c=a+b
        a=b
        b=c
        print(c)
fib2(20)
